Rain, storms expected overnight

Updated 12:53 am, Wednesday, January 25, 2012

A City of San Antonio worker hurries to get out of a downpour at HemisFair Plaza as rain showers hit the area early Tuesday. Thunderstorms are forecasted for today.

A City of San Antonio worker hurries to get out of a downpour at HemisFair Plaza as rain showers hit the area early Tuesday. Thunderstorms are forecasted for today.

Photo: Glara@express-news.net, Jerry Lara

Image 4 of 8

A single lane of traffic passes a three-car accident on U.S. 281 just south of Hildebrand about 12:45 p.m. Tuesday, Jan. 24, 2012. Southbound traffic on the highway was backed up past the Alamo Quarry Market for more than an hour.

A single lane of traffic passes a three-car accident on U.S. 281 just south of Hildebrand about 12:45 p.m. Tuesday, Jan. 24, 2012. Southbound traffic on the highway was backed up past the Alamo Quarry Market

Traffic backs up on southbound U.S. 281 just before Hildebrand about 12:45 p.m. Tuesday, Jan. 24, 2012. A three-car accident took place on the highway just north of Hildebrand, backing up traffic past the Alamo Quarry Market for more than an hour.

Traffic backs up on southbound U.S. 281 just before Hildebrand about 12:45 p.m. Tuesday, Jan. 24, 2012. A three-car accident took place on the highway just north of Hildebrand, backing up traffic past the Alamo

Antonio Ramirez comforts his wife, Michelle, as emergency personnel investigate the scene of a motor vehicle-pedestrian accident on U.S. 90, between Loop 410 and Military Drive on Tuesday, Jan. 24, 2012. A pedestrian was struck by a truck while attempting to cross the highway, according to a police officer on the scene. This caused a chain reaction that involved four vehicles. The pedestrian was taken to a local hospital with non-life threatening injures.

Antonio Ramirez comforts his wife, Michelle, as emergency personnel investigate the scene of a motor vehicle-pedestrian accident on U.S. 90, between Loop 410 and Military Drive on Tuesday, Jan. 24, 2012. A

NWS Forecaster Orlando Bermudez said isolated storms that moved into the area Tuesday were expected to strengthen between midnight and 8 a.m. today, and some could bring hail, winds up to 40 mph and possibly a tornado or two. A tornado watch is in effect until 5 a.m.

“There are isolated areas that could get more than two inches, and you cannot rule out an isolated tornado as well,” he said. “Any storm that develops Wednesday morning could be severe.”

A thick fog descended about 3 p.m. Tuesday in the Boerne area, where rain fell most of the day, making driving dangerous due to low visibility.

Drivers should be cautious crossing rivers and streams, but rainfall should cease by noon, Bermudez said. As the storm continues to move east, a cold front is expected to arrive by late tonight. Thursday will be cloudy and cold, with a low in the mid-40s, Bermudez said.